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Date: Mon, 1 Feb 2010 20:19:06 +0100
From: Christoph Hellwig <hch@....de>
To: roland@...hat.com, oleg@...hat.com
Cc: akpm@...ux-foundation.com, linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] use ptrace_request to handle {PEEK,POKE}{TEXT,DATA}
No need to call generic_ptrace_peekdata/generic_ptrace_pokedata or even
opencoding it when we can leave that to ptrace_request. Excepted are
those architecures not calling ptrace_request at all (m68knommu, h8300
and microblaze), and those having weird ABIs (alpha for the peek variants)
or needing additional cache flushing.
Signed-off-by: Christoph Hellwig <hch@....de>
Index: linux-2.6/arch/arm/kernel/ptrace.c
===================================================================
--- linux-2.6.orig/arch/arm/kernel/ptrace.c 2010-01-15 23:53:14.699003982 +0100
+++ linux-2.6/arch/arm/kernel/ptrace.c 2010-01-26 17:43:49.134004189 +0100
@@ -715,23 +715,10 @@ long arch_ptrace(struct task_struct *chi
/*
* read word at location "addr" in the child process.
*/
- case PTRACE_PEEKTEXT:
- case PTRACE_PEEKDATA:
- ret = generic_ptrace_peekdata(child, addr, data);
- break;
-
case PTRACE_PEEKUSR:
ret = ptrace_read_user(child, addr, (unsigned long __user *)data);
break;
- /*
- * write the word at location addr.
- */
- case PTRACE_POKETEXT:
- case PTRACE_POKEDATA:
- ret = generic_ptrace_pokedata(child, addr, data);
- break;
-
case PTRACE_POKEUSR:
ret = ptrace_write_user(child, addr, data);
break;
Index: linux-2.6/arch/avr32/kernel/ptrace.c
===================================================================
--- linux-2.6.orig/arch/avr32/kernel/ptrace.c 2010-01-15 23:53:14.708003943 +0100
+++ linux-2.6/arch/avr32/kernel/ptrace.c 2010-01-26 17:43:49.142004787 +0100
@@ -147,22 +147,11 @@ long arch_ptrace(struct task_struct *chi
switch (request) {
/* Read the word at location addr in the child process */
- case PTRACE_PEEKTEXT:
- case PTRACE_PEEKDATA:
- ret = generic_ptrace_peekdata(child, addr, data);
- break;
-
case PTRACE_PEEKUSR:
ret = ptrace_read_user(child, addr,
(unsigned long __user *)data);
break;
- /* Write the word in data at location addr */
- case PTRACE_POKETEXT:
- case PTRACE_POKEDATA:
- ret = generic_ptrace_pokedata(child, addr, data);
- break;
-
case PTRACE_POKEUSR:
ret = ptrace_write_user(child, addr, data);
break;
Index: linux-2.6/arch/cris/arch-v10/kernel/ptrace.c
===================================================================
--- linux-2.6.orig/arch/cris/arch-v10/kernel/ptrace.c 2010-01-15 23:53:14.725004085 +0100
+++ linux-2.6/arch/cris/arch-v10/kernel/ptrace.c 2010-01-26 17:43:49.154004008 +0100
@@ -82,12 +82,6 @@ long arch_ptrace(struct task_struct *chi
unsigned long __user *datap = (unsigned long __user *)data;
switch (request) {
- /* Read word at location address. */
- case PTRACE_PEEKTEXT:
- case PTRACE_PEEKDATA:
- ret = generic_ptrace_peekdata(child, addr, data);
- break;
-
/* Read the word at location address in the USER area. */
case PTRACE_PEEKUSR: {
unsigned long tmp;
@@ -101,12 +95,6 @@ long arch_ptrace(struct task_struct *chi
break;
}
- /* Write the word at location address. */
- case PTRACE_POKETEXT:
- case PTRACE_POKEDATA:
- ret = generic_ptrace_pokedata(child, addr, data);
- break;
-
/* Write the word at location address in the USER area. */
case PTRACE_POKEUSR:
ret = -EIO;
Index: linux-2.6/arch/cris/arch-v32/kernel/ptrace.c
===================================================================
--- linux-2.6.orig/arch/cris/arch-v32/kernel/ptrace.c 2010-01-15 23:53:14.734023252 +0100
+++ linux-2.6/arch/cris/arch-v32/kernel/ptrace.c 2010-01-26 17:43:49.171004353 +0100
@@ -143,12 +143,6 @@ long arch_ptrace(struct task_struct *chi
break;
}
- /* Write the word at location address. */
- case PTRACE_POKETEXT:
- case PTRACE_POKEDATA:
- ret = generic_ptrace_pokedata(child, addr, data);
- break;
-
/* Write the word at location address in the USER area. */
case PTRACE_POKEUSR:
ret = -EIO;
Index: linux-2.6/arch/m32r/kernel/ptrace.c
===================================================================
--- linux-2.6.orig/arch/m32r/kernel/ptrace.c 2010-01-15 23:53:14.757254286 +0100
+++ linux-2.6/arch/m32r/kernel/ptrace.c 2010-01-26 17:43:49.196003900 +0100
@@ -598,14 +598,6 @@ arch_ptrace(struct task_struct *child, l
switch (request) {
/*
- * read word at location "addr" in the child process.
- */
- case PTRACE_PEEKTEXT:
- case PTRACE_PEEKDATA:
- ret = generic_ptrace_peekdata(child, addr, data);
- break;
-
- /*
* read the word at location addr in the USER area.
*/
case PTRACE_PEEKUSR:
@@ -617,9 +609,8 @@ arch_ptrace(struct task_struct *child, l
* write the word at location addr.
*/
case PTRACE_POKETEXT:
- case PTRACE_POKEDATA:
ret = generic_ptrace_pokedata(child, addr, data);
- if (ret == 0 && request == PTRACE_POKETEXT)
+ if (ret == 0)
invalidate_cache();
break;
Index: linux-2.6/arch/microblaze/kernel/ptrace.c
===================================================================
--- linux-2.6.orig/arch/microblaze/kernel/ptrace.c 2010-01-15 23:53:14.776253915 +0100
+++ linux-2.6/arch/microblaze/kernel/ptrace.c 2010-01-26 17:49:02.239254508 +0100
@@ -78,26 +78,6 @@ long arch_ptrace(struct task_struct *chi
unsigned long copied;
switch (request) {
- case PTRACE_PEEKTEXT: /* read word at location addr. */
- case PTRACE_PEEKDATA:
- pr_debug("PEEKTEXT/PEEKDATA at %08lX\n", addr);
- copied = access_process_vm(child, addr, &val, sizeof(val), 0);
- rval = -EIO;
- if (copied != sizeof(val))
- break;
- rval = put_user(val, (unsigned long *)data);
- break;
-
- case PTRACE_POKETEXT: /* write the word at location addr. */
- case PTRACE_POKEDATA:
- pr_debug("POKETEXT/POKEDATA to %08lX\n", addr);
- rval = 0;
- if (access_process_vm(child, addr, &data, sizeof(data), 1)
- == sizeof(data))
- break;
- rval = -EIO;
- break;
-
/* Read/write the word at location ADDR in the registers. */
case PTRACE_PEEKUSR:
case PTRACE_POKEUSR:
Index: linux-2.6/arch/mips/kernel/ptrace.c
===================================================================
--- linux-2.6.orig/arch/mips/kernel/ptrace.c 2010-01-15 23:53:14.792004038 +0100
+++ linux-2.6/arch/mips/kernel/ptrace.c 2010-01-26 17:43:49.253004303 +0100
@@ -260,12 +260,6 @@ long arch_ptrace(struct task_struct *chi
int ret;
switch (request) {
- /* when I and D space are separate, these will need to be fixed. */
- case PTRACE_PEEKTEXT: /* read word at location addr. */
- case PTRACE_PEEKDATA:
- ret = generic_ptrace_peekdata(child, addr, data);
- break;
-
/* Read the word at location addr in the USER area. */
case PTRACE_PEEKUSR: {
struct pt_regs *regs;
@@ -390,12 +384,6 @@ long arch_ptrace(struct task_struct *chi
break;
}
- /* when I and D space are separate, this will have to be fixed. */
- case PTRACE_POKETEXT: /* write the word at location addr. */
- case PTRACE_POKEDATA:
- ret = generic_ptrace_pokedata(child, addr, data);
- break;
-
case PTRACE_POKEUSR: {
struct pt_regs *regs;
ret = 0;
Index: linux-2.6/arch/um/kernel/ptrace.c
===================================================================
--- linux-2.6.orig/arch/um/kernel/ptrace.c 2010-01-15 23:53:14.844003754 +0100
+++ linux-2.6/arch/um/kernel/ptrace.c 2010-01-26 17:43:49.276003735 +0100
@@ -42,23 +42,11 @@ long arch_ptrace(struct task_struct *chi
unsigned long __user *p = (void __user *)(unsigned long)data;
switch (request) {
- /* read word at location addr. */
- case PTRACE_PEEKTEXT:
- case PTRACE_PEEKDATA:
- ret = generic_ptrace_peekdata(child, addr, data);
- break;
-
/* read the word at location addr in the USER area. */
case PTRACE_PEEKUSR:
ret = peek_user(child, addr, data);
break;
- /* write the word at location addr. */
- case PTRACE_POKETEXT:
- case PTRACE_POKEDATA:
- ret = generic_ptrace_pokedata(child, addr, data);
- break;
-
/* write the word at location addr in the USER area */
case PTRACE_POKEUSR:
ret = poke_user(child, addr, data);
Index: linux-2.6/arch/xtensa/kernel/ptrace.c
===================================================================
--- linux-2.6.orig/arch/xtensa/kernel/ptrace.c 2010-01-15 23:53:14.852004145 +0100
+++ linux-2.6/arch/xtensa/kernel/ptrace.c 2010-01-26 17:43:49.315254186 +0100
@@ -250,20 +250,10 @@ long arch_ptrace(struct task_struct *chi
int ret = -EPERM;
switch (request) {
- case PTRACE_PEEKTEXT: /* read word at location addr. */
- case PTRACE_PEEKDATA:
- ret = generic_ptrace_peekdata(child, addr, data);
- break;
-
case PTRACE_PEEKUSR: /* read register specified by addr. */
ret = ptrace_peekusr(child, addr, (void __user *) data);
break;
- case PTRACE_POKETEXT: /* write the word at location addr. */
- case PTRACE_POKEDATA:
- ret = generic_ptrace_pokedata(child, addr, data);
- break;
-
case PTRACE_POKEUSR: /* write register specified by addr. */
ret = ptrace_pokeusr(child, addr, data);
break;
Index: linux-2.6/arch/alpha/kernel/ptrace.c
===================================================================
--- linux-2.6.orig/arch/alpha/kernel/ptrace.c 2010-01-15 23:53:14.691006315 +0100
+++ linux-2.6/arch/alpha/kernel/ptrace.c 2010-01-26 17:43:49.334254716 +0100
@@ -285,12 +285,6 @@ long arch_ptrace(struct task_struct *chi
DBG(DBG_MEM, ("peek $%ld->%#lx\n", addr, ret));
break;
- /* When I and D space are separate, this will have to be fixed. */
- case PTRACE_POKETEXT: /* write the word at location addr. */
- case PTRACE_POKEDATA:
- ret = generic_ptrace_pokedata(child, addr, data);
- break;
-
case PTRACE_POKEUSR: /* write the specified register */
DBG(DBG_MEM, ("poke $%ld<-%#lx\n", addr, data));
ret = put_reg(child, addr, data);
--
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